﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Cat_Miau
{
    class Sequence
    {
        // field
        private static int currentNum = 0;

        // constructor
        private Sequence()
        {

        }

        // method

        static public int NextNum()
        {
            currentNum++;
            return currentNum;

        }

    }
}
